Micrometer-indicator.



Patented Sept. I0, |90L J. BULET.

MICRUMETER INDICATOR.

(Application led June 7, 1901.)

(No Model.)

A so

UNITED STATES PATENT EEicE.

JOSEPH BOULET, OF BEVERLY, MASSACHUSETTS.

MICROMETER-INDICATOR.

SPECIFICATION forming part of Letters Patent No. 682,450, dated September 10, 1901.

Application filed .Tune 7Il 1901.

To all whom t may concern:

Be it known that I, JOSEPH BOULET, a citizen of Canada, and a subject of the King of Great Britain, residing at Beverly, in the county of Essex and State of Massachusetts, have invented a new and useful Improvement in Micrometer-Indicators, of which the following is a speciiication.

My invention relates to improvements in micrometer-indicators for machinists use, and has for its object to improve the indicator described in Letters Patent of the United States No. 659,048, issued to me October 2, 1900, in details of construction and to increase its usefulness and reliability, which object I attain by means of the construction illustrated inthe accompanying drawings, in which* `Figure l is a side elevation of a tool embodying my` invention. Fig. 2 is a top View, partly in section, as on line 2 2, Fig. l. Fig. 3 is a longitudinal section taken vertically as on line 3 3, Fig. 2. Fig. 4 is a sectional plan of a portion of the tool as on line 4, Fig. 3. Fig. 5 is a perspective ot' the pivot-block detached and of the indeX-arm inserted therein and of the upholding-plug in which the pivot of the block is seated. Fig. 6 is an illustrative drawing showing the tool as held in the tool-post of a lathe, and Fig. 7 is an illustrative drawing showing the tool as when attached to the vertically-adjustable sliding block on the standard of a surface-gage.

A is the body of the tool; B, ahole bored in the under side of the body to receive the pivot-block; O, the upholding-plug secured to the body by screws and having an adjustable center C, which serves as the seat of the lower point of the pivot-block D.

E is the diametric'al slot milled across the pivot-block.

D and D2 are the pivot-points of the block.

F is the needle which presses eccentrieally against the side of slot E to turn the pivotblock, and G is the spring coiled about the pivot to resist the thrust of the needle and to hold the index-arm H, which moves in passage I, in its resting position on scale .I and under the limiting-guard K.

The arm L is screwed into the body, as shown, and carries the needle F, which pro- Serial No. 63,503. (No model.)

jects outwardly and bears inwardly against pivot-block D in slot E.

Thus far the construction, arrangement, and mode of operation are substantially the same as described in my former patent hereinbefore referred to, with the exception of the adjustable center OQ which is tightly tted in the upholding-plug C, so that it may be adjusted by driving against the lower pivot-point D"2 to take up any looseness occasioned by wearin a convenient and eiective manner. by making it with a curve and suitable al1- gles to adapt it to improvements in the body of the tool.

I place in the passage I a block IQ. which fills the passage on one side iiush with the outer face of the tool, but inwardly has a curved oulline,and is secured in place by pointed screws I2, turned downward through the upper part ofthe body and onto the block, so as to press the same iirmly. The object of this inserted block is to support the thinner overhanging part of the body above the passage I and prevent it from being sprung downward by the pressure of the tool-post screw, so as to bind the index-arm and interfere with its free action when such part of the tool is so held in the post, and thus itincreases the longitudinal range of the tool in the post when in practical use, and the irregular outline of the index-arm adapts it lo the inner contour of this block without its unduly projecting beyond the sides of the tool in the course of its movement over the face of the scale.

I have further modified the body of the tool by making a series of holes M M transversely through the same to adapt it for use upon a surface-gage in the manner illustrated in Fig. 7, in which is shown a screw-stud N, projecting outwardly from the verticallyadjustable block or sleeve Non standard P of the surface-gage and passing through one of the openings M in the tool. A thumb-nutN2 is threaded onto the end of the stud and clamps the tool between it and block N', and thus holds it iirmly in proper relation to the standard. For this purpose of gagng or testing horizontal plane surfaces and detecting slight departures from their true level I The index-arm is also varied' IOO have further improved my indicator by devising and making the auxiliary attachment shown as detachably applied vto the end of arm L in Fig. I. This attachment is comprised of an angular body R, provided with a taper sleeve R',tted to the end of arm L, a needle-holding branch R2, aneedle F', suspend ed in and projecting downward from branch R2, and an oscillating block R3, pivoted in an angle of body R at R4 intermediate between the two needle-passages and having its body properly formed to bear against the ends of the needles F and F', thereby transmitting the movement of one to the other. When needle F' is passed along in Contact with the surface of a piece of work and is moved inward by the inequality of the surface, it will press against one end of block R3 and through it force inward needle F in arm L against the pivot-block D, thereby turning the block and swinging the index-arm H along scale J accordingly and against the resistance of the helical spring G, thus indicating on the scale through arm II in the usual manner, and when the pressure on the end of needle F' is removed then spring G by its reaction will force the parts back into their normal positions of rest. Vllen this attachment is applied to arm L and the tool is used upon a surface-gage, as shown in Fig. 7, the needle F' may be adjustably rotated through the turning of its sleeve R' upon and around arm L, so as to cause the needle to impinge on the face of a surface parallel to the axis of the needle in any direction therefrom.

indexarm H, adapted to vibrate in said pas- I sage in conformity with said block; a pivotblock D; a plug C, provided with an adjustable center C'; a spring G; an arm L; a needle F; and a scale J; all as specified.

2. A micrometer-indicator comprising a body A, provided with a horizontal passage I, and a series of transverse holes M, through the body; an extension-arm L; pi vot-block D; plug C, having an adjustable center C'; arm H; needle F; spring G; scale J; a detachable auxiliary needle F', arranged at right angles to needle F, and supported by a body R, having a sleeve R', fitted to arm L, and an oscillating block R3, pivoted to body R, and arranged to act in Contact with and between the ends of needles F and F',` s0 as to transmit the movement of one 'directly to the other; all substantially as specified.

JOSEPH BOULE'I.

Witnesses:

E. J. PARMENTER, EUGENE HUMPHREY. 

